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Software Development Terms Beginning with T

Temporal Dead Zone in JavaScript

A temporal dead zone (TDZ) is the area of a block where a variable is inaccessible until the moment the computer completely initializes it with a value.

Terminal

A terminal is a computer’s text interface allowing you to type commands for the computer to run.

Ternary Operator in JavaScript

Ternary operators are operators that accept three operands. An example is the conditional operator.

Test Doubles (TDD)

Test doubles are the imitation objects used to mimic real dependencies like databases, libraries, networks, and APIs.

Test Runner

A test runner executes your testing scripts and displays results in the command line (CLI).

Test-Driven Development

Test-driven development is a coding practice where you write the result you want your program to produce before creating the program.

`test()` in JavaScript

test() tests its string argument for an occurrence of a regular expression.

Text

Text is the characters of a piece of writing.

Text Markup

Text Markup means Text Note (that is, the note added to a text to help typesetters (or computers) better understand how to present the marked-up text).

Textual Data

Textual data are the written contents of a page, such as letters (e.g., A, B, C), numbers (e.g., 1, 2, 3), symbols (e.g., $, #, +), and code (e.g., <input>, body { background: #A18A77; }, if (condition) { //execute code }).

Thenable (JavaScript)

Thenable in JavaScript refers to any object that contains a then() method.

`this` in JavaScript

JavaScript’s this keyword refers to the owner object of the keyword’s method or the this value of an arrow function’s lexical context.

Time to First Byte

Time to First Byte (TTFB) is the time between a client’s request and the server’s first byte of response.

Google defines an TTFB of 0.8 seconds or less as good.

Time To Interactive

Time To Interactive (TTI) measures how long it takes, from the start of page load, until the user can reliably interact with the page.

A page becomes fully interactive when:

It displays meaningful content, as measured by the First Contentful Paint.
The browser registers event handlers for the most visible elements on the page.
The page responds to the user’s interactions within 50 milliseconds.

Google defines a TTI of 5 seconds on an average mobile device as good.

TO (RegExp)

A regular expression’s TO operator ([a-z]) defines the range of characters you wish to find in a single character’s position.

`toLowerCase()` in JavaScript

toLowerCase() returns the lowercase version of its calling string.

Top-Level Domain

The top-level domain (TLD) is what follows the domain name in a URL.

Top-Level Module (JavaScript)

A top-level module is a script containing other modules.

`toString()` JavaScript Number Method

toString() converts a number to a string of a specified radix.

`toUpperCase()` in JavaScript

toUpperCase() returns the uppercase version of its calling string.

Transpiler

A transpiler, also known as a source-to-source compiler, is a tool that translates source code from one programming language into another.

Transpiling is particularly valuable for utilizing new language features that lack universal browser support.

Common JavaScript transpilers include Babel, TypeScript, and CoffeeScript.
Common CSS transpilers include Sass, Less, and Stylus.

Tree shaking

Tree shaking is the removal of unused code (dead code) from a codebase.

`trim()` in JavaScript

trim() trims whitespace from both ends of a string.

`trimEnd()` in JavaScript

trimEnd() trims whitespace only at the end of a string.

`trimStart()` in JavaScript

trimStart() trims whitespace only at the beginning of a string.

Truthy in JavaScript

Truthy values are values JavaScript considers to be true.

All JavaScript’s values are true except 0 (zero), false, "" (empty string), NaN, null, undefined, and 0n (BigInt zero)—which are falsy.

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